1) Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, United States, 2) School of Earth, Ocean and Climate Sciences, Indian Institute of Technology-Bhubaneswar, Bhubaneswar, Odisha 751013, India
Analytical Chemistry (2014), V86, pp2982−2988, doi: 10.1021/ac403413y
Determination of Osmium Concentrations and 187Os/188Os of Crude Oils and Source Rocks by Coupling High-Pressure, High-Temperature Digestion with Sparging OsO4 into a Multicollector Inductively Coupled Plasma Mass Spectrometer
Indra S. Sen (1,2) and Bernhard Peucker-Ehrenbrink (1)
The 187Os/188Os ratio that is based on the β−-decay of 187Re to 187Os (t1/2 = 41.6 billion years) is widely used to investigate petroleum system processes. Despite its broad applicability to studies of hydrocarbon deposits worldwide, a suitable matrix-matched reference material for Os analysis does not exist. In this study, a method that enables Os isotope measurement of crude oil with in-line Os separation and purification from the sample matrix is proposed. The method to analyze Os concentration and 187Os/187Os involves sample digestion under high pressure and high temperature using a high pressure asher (HPA-S, Anton Paar), sparging of volatile osmium tetroxide from the sample solution, and measurements using multicollector inductively coupled plasma mass spectrometry (MCICPMS).
- MC-ICPMS
- Neptune
- Os isotopes
- Crude oils
United States
